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roblemsforPractice, , i. Ten positively charged particles are kept fixed on, the y-axis at points x = 10 cm, 20 cm, 30 cm, ...,, 100 cm. The first particle has a charge 1.0 x 10° c;, the second 8 x 10°8 C, third 27 x 10° C, and so on., The tenth particle has a charge 1000 x 10° C. Find, the magnitude of the electric force acting on a1 C, charge placed at the origin. (Ans. 4.95 x10°N), , >. Charges q, = 1.5mC, q, = 0.2 mCand q, = - 0.5 mC, are placed at the points A, Band C respectively, as, shown in Fig. 1.32. If 7 =12m and 7, =0.6m,, calculate the magnitude of resultant force on qp., , (Ans. 3.125 x 10° N), , Cc, 93, , B, A —»F,, qy 42, , Fig. 1.32, , 3. Two equal positive charges, each of 2uC interact, with a third positive charge of 3uC situated as, shown in Fig. 1.33. Find the magnitude and, direction of the force experienced by the charge of, 3uC. (Ans. 3.456 x 10° N, along OC produced), , € anc, 3m! , "= Sine, , O: : av, , ' 4m a ., 3m:, , be, , B 2 pC, , Fig.. 1.33